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raise forest functional level
Need check what before raise forest functional level to 2012 r2 ? and can rollback if use windows server 2012 r2 and current forest function is 2008 r2 ?
Yes, it is doable.
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Read on here about roll back options and dependencies
What Are Active Directory Functional Levels?: Active Directory | Microsoft Docs
as link Docs My understand is our windows 2012 r2 (enable Active Directory Recycle Bin ) upgrade forest,domain from 2008 r2 to 2012 r2 then can downgrade because windows 2012 r2 is support ?
Yes, it is doable.
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